Preheat oven to 300 degrees F. In a roasting pan, combine crackers, pretzels, and peanuts. In a bowl, stir together melted butter, Italian seasoning, pepper, and garlic; drizzle over cracker mixture. Stir to evenly coat.
Bake, uncovered, for 45 minutes, stirring every 15 minutes. Spread snack mix on large sheet of foil to cool.